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No simple formula.

When you add 100 kg to the boat, it displaces 100kg, ~ 100l water.

You must then calculate how much lower the boat gets in the water, to displace that water.

It would be easier, if the boat had vertical sides, like a barrel or a box, otherwise you need to do integration (calculus).

If the boat is not rocking, and the water is perfectly still, you can put people into the boat, until the weight of the people equals the weight of the water displaced when the edge of the boat is at the edge of the water.

But in real life, you must account for waves, wind etc.

Then there is seating capacity, toilets, food etc, if we are talking about a liner or ferry.

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14y ago

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